66805471 has 8 divisors (see below), whose sum is σ = 68612544. Its totient is φ = 65014560.

The previous prime is 66805457. The next prime is 66805477. The reversal of 66805471 is 17450866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66805471 - 2¹¹ = 66803423 is a prime.

It is a super-3 number, since 3×66805471³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66805471.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66805477) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4581 + ... + 12433.

It is an arithmetic number, because the mean of its divisors is an integer number (8576568).

Almost surely, 2^66805471 is an apocalyptic number.

66805471 is a deficient number, since it is larger than the sum of its proper divisors (1807073).

66805471 is a wasteful number, since it uses less digits than its factorization.

66805471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8081.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 66805471 is about 8173.4613842606. The cubic root of 66805471 is about 405.7613499555.

It can be divided in two parts, 66805 and 471, that added together give a palindrome (67276).

The spelling of 66805471 in words is "sixty-six million, eight hundred five thousand, four hundred seventy-one".